THE NERVOUS SYSTEM 



519 



the Purkinje cells and their cross sections together with the terminal 

 dendritic arborizations of the Purkinje cells give the molecular layer 

 its punctate appearance. The scattered larger cells in the granular 

 layer are principally short axone or Golgi cells, whose main dendrites 

 usually penetrate and branch within the molecular layer. Their 

 axones often form very extensive and complicated arborizations in 

 the granular layer, the terminations of which are concentrated in 

 the glomeruli (Fig. 351,7). Dislocated cells of this type may have 

 their cell bodies in the molecular laver. 



Fig. 352. — Cross Section of a Cerebellar Convolution Stained by Weigert's Method 

 (Kolliker.) m, Molecular layer; K, granular layer; w, white matter; q, fine fibres passing 

 from white matter into the molecular layer; tr, dots represent longitudinal fibres of molec- 

 ular layer among bodies of Purkinje cells. 



In the cortex there are also the terminations of the afferent 

 cerebellar fibres already mentioned (p. 513). These are of two types, 

 mossy fibres and climbing fibres. The mossy fibres, so called from 

 the appearance of their terminations in embryos, are the coarsest 

 fibres of the white matter. While in the latter they bifurcate, 

 branches going to different laminae. These main branches give off 

 secondary branches which enter the granular layer and there arborize. 

 During their course, and also at their terminations, these branches 

 are thickened in places and there give off short, thick, terminal 



